Publications Internationales

Permanent URI for this collectionhttps://dspace.univ-boumerdes.dz/handle/123456789/13

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Author: search.filters.author.Boudjema, Hamada

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    Spectroscopic characterization andthermal decomposition kinetics of 1,3-dibutyl-imidazolium bromide synthesized through a solvent-free and one-pot method
    (Elsevier, 2021) Achour, Sabrina; Boudjema, Hamada; Baroudi, Salem; Abdelaziz, Amir; Rezazgui, Ismail; Trache, Djalal
    Imidazolium-based ionic liquids (ILs), as one of the most popular and investigated classes of ILs owing to their outstanding physicochemical features, find applications in different fields over the last decades. Their thermal stability is of paramount importance for their effective use at elevated temperatures. 1,3-dibutyl-imidazolium bromide ([BBIm][Br] is an interesting IL, which may be employed for different purposes. Nevertheless, its thermal stability and decomposition kinetic are scarce. In the present work, 1,3-dibutyl-imidazolium bromide ([BBIm][Br]) is successfully synthesized through a simple, clean, and efficient solvent-free and one-pot ultrasonic method. Its structure was assessed by DSC, FTIR, Raman spectroscopies, µXRF, one-dimensional (1-D) liquid state 1H, 13C, and 15N NMR. The 2-D NMR analyses thoroughly discussed herein corroborated the structure of the cation as well as the alkyl side chains. Its thermal stability and decomposition kinetic were performed with non-isothermal thermogravimetry analysis at different heating rates. The kinetic triplet was determined using isoconversional kinetic methods. It is revealed that [BBIm][Br] undergoes a single step mass loss in the temperature range of 180–380 °C for which the activation energy is 140 kJ/mol. Furthermore, it is proved that the decomposition mechanism that best represents the experimental data is the nth order (Fn) reaction mechanism
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    Liquid-liquid extraction and simultaneously spectrophotometric determination of Co (II) and W (VI) using crown ether (DB-18-C6) in aqueous media and in high speed steel
    (Taylor and Francis Online, 2020) Saoud, Abdesselam; Hammadou née Mesdour, Souad; Arzu, Nabieva; Boudjema, Hamada; Abdeltif, Amrane; Nabiev, Mohamed
    An analytical reagent ether crown DB-18-C-6 was extensively used forthe simultaneous and individual extraction and spectrophotometricdetermination of the tungsten and cobalt at microgram levels. Theligand reacts with two metals, and the ion-association systems wereextractable into chloroform giving a yellowish [(DB-18-C-6∙NH4)+2[WO(SCN)5]2]and[(DB-18-C-6∙NH4)+2[Co(SCN)4]2-]complexes.Theabsorption peaks of these complexes were found overlapping atλmax of 415 nm and 621.6 nm, respectively. Under optimum condi-tions, the [WO(SCN)4]2-] complexation and extraction are possible onlyin concentrated medium (2.5 M of HCl). While, the [Co(SCN)4]2-]wasextractable at a pH range of 4–10. The linear ranges were 29.45–-147.25μgmL−1for Co(II) and 1.8–183 μg/mL for W(VI) with molarabsorptivity,ε=1.7×104andε=1.6×104dm3mol−1cm−1,respec-tively. The accuracy and reproducibility of the proposed method forvarious amounts of cobalt and tungstenintheirbinarymixtureweretested, and the effects of diverse ions on their extraction were alsoinvestigated. The developed method was successfully applied for thesimultaneous determination of Co(II) and W(VI) in high-speed steel(HS2-9-1-8) containing 2% W, 9% Mo, 1% V, and 8% Co.
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    Vanadium-catalyzed extractive oxidesulfurization of commercial diesel in ionic liquid with combined oxidizing agents
    (Taylor & Francis, 2019) Benmabrouka, Hafsa; Mesdour, Souad; Boufades, Djamila; Moussiden, Anissa; Berrabia, Nadjet; Tliba, Louey; Boudjema, Hamada